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                                <section class="normal markdown-section">
                                
                                <h1 id="&#x5B9E;&#x4F8B;&#x5BF9;&#x8C61;&#x4E0E;-new-&#x547D;&#x4EE4;">&#x5B9E;&#x4F8B;&#x5BF9;&#x8C61;&#x4E0E; new &#x547D;&#x4EE4;</h1>
<p>JavaScript &#x8BED;&#x8A00;&#x5177;&#x6709;&#x5F88;&#x5F3A;&#x7684;&#x9762;&#x5411;&#x5BF9;&#x8C61;&#x7F16;&#x7A0B;&#x80FD;&#x529B;&#xFF0C;&#x672C;&#x7AE0;&#x4ECB;&#x7ECD; JavaScript &#x9762;&#x5411;&#x5BF9;&#x8C61;&#x7F16;&#x7A0B;&#x7684;&#x57FA;&#x7840;&#x77E5;&#x8BC6;&#x3002;</p>
<h2 id="&#x5BF9;&#x8C61;&#x662F;&#x4EC0;&#x4E48;">&#x5BF9;&#x8C61;&#x662F;&#x4EC0;&#x4E48;</h2>
<p>&#x9762;&#x5411;&#x5BF9;&#x8C61;&#x7F16;&#x7A0B;&#xFF08;Object Oriented Programming&#xFF0C;&#x7F29;&#x5199;&#x4E3A; OOP&#xFF09;&#x662F;&#x76EE;&#x524D;&#x4E3B;&#x6D41;&#x7684;&#x7F16;&#x7A0B;&#x8303;&#x5F0F;&#x3002;&#x5B83;&#x5C06;&#x771F;&#x5B9E;&#x4E16;&#x754C;&#x5404;&#x79CD;&#x590D;&#x6742;&#x7684;&#x5173;&#x7CFB;&#xFF0C;&#x62BD;&#x8C61;&#x4E3A;&#x4E00;&#x4E2A;&#x4E2A;&#x5BF9;&#x8C61;&#xFF0C;&#x7136;&#x540E;&#x7531;&#x5BF9;&#x8C61;&#x4E4B;&#x95F4;&#x7684;&#x5206;&#x5DE5;&#x4E0E;&#x5408;&#x4F5C;&#xFF0C;&#x5B8C;&#x6210;&#x5BF9;&#x771F;&#x5B9E;&#x4E16;&#x754C;&#x7684;&#x6A21;&#x62DF;&#x3002;</p>
<p>&#x6BCF;&#x4E00;&#x4E2A;&#x5BF9;&#x8C61;&#x90FD;&#x662F;&#x529F;&#x80FD;&#x4E2D;&#x5FC3;&#xFF0C;&#x5177;&#x6709;&#x660E;&#x786E;&#x5206;&#x5DE5;&#xFF0C;&#x53EF;&#x4EE5;&#x5B8C;&#x6210;&#x63A5;&#x53D7;&#x4FE1;&#x606F;&#x3001;&#x5904;&#x7406;&#x6570;&#x636E;&#x3001;&#x53D1;&#x51FA;&#x4FE1;&#x606F;&#x7B49;&#x4EFB;&#x52A1;&#x3002;&#x5BF9;&#x8C61;&#x53EF;&#x4EE5;&#x590D;&#x7528;&#xFF0C;&#x901A;&#x8FC7;&#x7EE7;&#x627F;&#x673A;&#x5236;&#x8FD8;&#x53EF;&#x4EE5;&#x5B9A;&#x5236;&#x3002;&#x56E0;&#x6B64;&#xFF0C;&#x9762;&#x5411;&#x5BF9;&#x8C61;&#x7F16;&#x7A0B;&#x5177;&#x6709;&#x7075;&#x6D3B;&#x3001;&#x4EE3;&#x7801;&#x53EF;&#x590D;&#x7528;&#x3001;&#x9AD8;&#x5EA6;&#x6A21;&#x5757;&#x5316;&#x7B49;&#x7279;&#x70B9;&#xFF0C;&#x5BB9;&#x6613;&#x7EF4;&#x62A4;&#x548C;&#x5F00;&#x53D1;&#xFF0C;&#x6BD4;&#x8D77;&#x7531;&#x4E00;&#x7CFB;&#x5217;&#x51FD;&#x6570;&#x6216;&#x6307;&#x4EE4;&#x7EC4;&#x6210;&#x7684;&#x4F20;&#x7EDF;&#x7684;&#x8FC7;&#x7A0B;&#x5F0F;&#x7F16;&#x7A0B;&#xFF08;procedural programming&#xFF09;&#xFF0C;&#x66F4;&#x9002;&#x5408;&#x591A;&#x4EBA;&#x5408;&#x4F5C;&#x7684;&#x5927;&#x578B;&#x8F6F;&#x4EF6;&#x9879;&#x76EE;&#x3002;</p>
<p>&#x90A3;&#x4E48;&#xFF0C;&#x201C;&#x5BF9;&#x8C61;&#x201D;&#xFF08;object&#xFF09;&#x5230;&#x5E95;&#x662F;&#x4EC0;&#x4E48;&#xFF1F;&#x6211;&#x4EEC;&#x4ECE;&#x4E24;&#x4E2A;&#x5C42;&#x6B21;&#x6765;&#x7406;&#x89E3;&#x3002;</p>
<p><strong>&#xFF08;1&#xFF09;&#x5BF9;&#x8C61;&#x662F;&#x5355;&#x4E2A;&#x5B9E;&#x7269;&#x7684;&#x62BD;&#x8C61;&#x3002;</strong></p>
<p>&#x4E00;&#x672C;&#x4E66;&#x3001;&#x4E00;&#x8F86;&#x6C7D;&#x8F66;&#x3001;&#x4E00;&#x4E2A;&#x4EBA;&#x90FD;&#x53EF;&#x4EE5;&#x662F;&#x5BF9;&#x8C61;&#xFF0C;&#x4E00;&#x4E2A;&#x6570;&#x636E;&#x5E93;&#x3001;&#x4E00;&#x5F20;&#x7F51;&#x9875;&#x3001;&#x4E00;&#x4E2A;&#x4E0E;&#x8FDC;&#x7A0B;&#x670D;&#x52A1;&#x5668;&#x7684;&#x8FDE;&#x63A5;&#x4E5F;&#x53EF;&#x4EE5;&#x662F;&#x5BF9;&#x8C61;&#x3002;&#x5F53;&#x5B9E;&#x7269;&#x88AB;&#x62BD;&#x8C61;&#x6210;&#x5BF9;&#x8C61;&#xFF0C;&#x5B9E;&#x7269;&#x4E4B;&#x95F4;&#x7684;&#x5173;&#x7CFB;&#x5C31;&#x53D8;&#x6210;&#x4E86;&#x5BF9;&#x8C61;&#x4E4B;&#x95F4;&#x7684;&#x5173;&#x7CFB;&#xFF0C;&#x4ECE;&#x800C;&#x5C31;&#x53EF;&#x4EE5;&#x6A21;&#x62DF;&#x73B0;&#x5B9E;&#x60C5;&#x51B5;&#xFF0C;&#x9488;&#x5BF9;&#x5BF9;&#x8C61;&#x8FDB;&#x884C;&#x7F16;&#x7A0B;&#x3002;</p>
<p><strong>&#xFF08;2&#xFF09;&#x5BF9;&#x8C61;&#x662F;&#x4E00;&#x4E2A;&#x5BB9;&#x5668;&#xFF0C;&#x5C01;&#x88C5;&#x4E86;&#x5C5E;&#x6027;&#xFF08;property&#xFF09;&#x548C;&#x65B9;&#x6CD5;&#xFF08;method&#xFF09;&#x3002;</strong></p>
<p>&#x5C5E;&#x6027;&#x662F;&#x5BF9;&#x8C61;&#x7684;&#x72B6;&#x6001;&#xFF0C;&#x65B9;&#x6CD5;&#x662F;&#x5BF9;&#x8C61;&#x7684;&#x884C;&#x4E3A;&#xFF08;&#x5B8C;&#x6210;&#x67D0;&#x79CD;&#x4EFB;&#x52A1;&#xFF09;&#x3002;&#x6BD4;&#x5982;&#xFF0C;&#x6211;&#x4EEC;&#x53EF;&#x4EE5;&#x628A;&#x52A8;&#x7269;&#x62BD;&#x8C61;&#x4E3A;<code>animal</code>&#x5BF9;&#x8C61;&#xFF0C;&#x4F7F;&#x7528;&#x201C;&#x5C5E;&#x6027;&#x201D;&#x8BB0;&#x5F55;&#x5177;&#x4F53;&#x662F;&#x90A3;&#x4E00;&#x79CD;&#x52A8;&#x7269;&#xFF0C;&#x4F7F;&#x7528;&#x201C;&#x65B9;&#x6CD5;&#x201D;&#x8868;&#x793A;&#x52A8;&#x7269;&#x7684;&#x67D0;&#x79CD;&#x884C;&#x4E3A;&#xFF08;&#x5954;&#x8DD1;&#x3001;&#x6355;&#x730E;&#x3001;&#x4F11;&#x606F;&#x7B49;&#x7B49;&#xFF09;&#x3002;</p>
<h2 id="&#x6784;&#x9020;&#x51FD;&#x6570;">&#x6784;&#x9020;&#x51FD;&#x6570;</h2>
<p>&#x9762;&#x5411;&#x5BF9;&#x8C61;&#x7F16;&#x7A0B;&#x7684;&#x7B2C;&#x4E00;&#x6B65;&#xFF0C;&#x5C31;&#x662F;&#x8981;&#x751F;&#x6210;&#x5BF9;&#x8C61;&#x3002;&#x524D;&#x9762;&#x8BF4;&#x8FC7;&#xFF0C;&#x5BF9;&#x8C61;&#x662F;&#x5355;&#x4E2A;&#x5B9E;&#x7269;&#x7684;&#x62BD;&#x8C61;&#x3002;&#x901A;&#x5E38;&#x9700;&#x8981;&#x4E00;&#x4E2A;&#x6A21;&#x677F;&#xFF0C;&#x8868;&#x793A;&#x67D0;&#x4E00;&#x7C7B;&#x5B9E;&#x7269;&#x7684;&#x5171;&#x540C;&#x7279;&#x5F81;&#xFF0C;&#x7136;&#x540E;&#x5BF9;&#x8C61;&#x6839;&#x636E;&#x8FD9;&#x4E2A;&#x6A21;&#x677F;&#x751F;&#x6210;&#x3002;</p>
<p>&#x5178;&#x578B;&#x7684;&#x9762;&#x5411;&#x5BF9;&#x8C61;&#x7F16;&#x7A0B;&#x8BED;&#x8A00;&#xFF08;&#x6BD4;&#x5982; C++ &#x548C; Java&#xFF09;&#xFF0C;&#x90FD;&#x6709;&#x201C;&#x7C7B;&#x201D;&#xFF08;class&#xFF09;&#x8FD9;&#x4E2A;&#x6982;&#x5FF5;&#x3002;&#x6240;&#x8C13;&#x201C;&#x7C7B;&#x201D;&#x5C31;&#x662F;&#x5BF9;&#x8C61;&#x7684;&#x6A21;&#x677F;&#xFF0C;&#x5BF9;&#x8C61;&#x5C31;&#x662F;&#x201C;&#x7C7B;&#x201D;&#x7684;&#x5B9E;&#x4F8B;&#x3002;&#x4F46;&#x662F;&#xFF0C;JavaScript &#x8BED;&#x8A00;&#x7684;&#x5BF9;&#x8C61;&#x4F53;&#x7CFB;&#xFF0C;&#x4E0D;&#x662F;&#x57FA;&#x4E8E;&#x201C;&#x7C7B;&#x201D;&#x7684;&#xFF0C;&#x800C;&#x662F;&#x57FA;&#x4E8E;&#x6784;&#x9020;&#x51FD;&#x6570;&#xFF08;constructor&#xFF09;&#x548C;&#x539F;&#x578B;&#x94FE;&#xFF08;prototype&#xFF09;&#x3002;</p>
<p>JavaScript &#x8BED;&#x8A00;&#x4F7F;&#x7528;&#x6784;&#x9020;&#x51FD;&#x6570;&#xFF08;constructor&#xFF09;&#x4F5C;&#x4E3A;&#x5BF9;&#x8C61;&#x7684;&#x6A21;&#x677F;&#x3002;&#x6240;&#x8C13;&#x201D;&#x6784;&#x9020;&#x51FD;&#x6570;&#x201D;&#xFF0C;&#x5C31;&#x662F;&#x4E13;&#x95E8;&#x7528;&#x6765;&#x751F;&#x6210;&#x5B9E;&#x4F8B;&#x5BF9;&#x8C61;&#x7684;&#x51FD;&#x6570;&#x3002;&#x5B83;&#x5C31;&#x662F;&#x5BF9;&#x8C61;&#x7684;&#x6A21;&#x677F;&#xFF0C;&#x63CF;&#x8FF0;&#x5B9E;&#x4F8B;&#x5BF9;&#x8C61;&#x7684;&#x57FA;&#x672C;&#x7ED3;&#x6784;&#x3002;&#x4E00;&#x4E2A;&#x6784;&#x9020;&#x51FD;&#x6570;&#xFF0C;&#x53EF;&#x4EE5;&#x751F;&#x6210;&#x591A;&#x4E2A;&#x5B9E;&#x4F8B;&#x5BF9;&#x8C61;&#xFF0C;&#x8FD9;&#x4E9B;&#x5B9E;&#x4F8B;&#x5BF9;&#x8C61;&#x90FD;&#x6709;&#x76F8;&#x540C;&#x7684;&#x7ED3;&#x6784;&#x3002;</p>
<p>&#x6784;&#x9020;&#x51FD;&#x6570;&#x5C31;&#x662F;&#x4E00;&#x4E2A;&#x666E;&#x901A;&#x7684;&#x51FD;&#x6570;&#xFF0C;&#x4F46;&#x662F;&#x6709;&#x81EA;&#x5DF1;&#x7684;&#x7279;&#x5F81;&#x548C;&#x7528;&#x6CD5;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> Vehicle = <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) </span>{
  <span class="hljs-keyword">this</span>.price = <span class="hljs-number">1000</span>;
};
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;<code>Vehicle</code>&#x5C31;&#x662F;&#x6784;&#x9020;&#x51FD;&#x6570;&#x3002;&#x4E3A;&#x4E86;&#x4E0E;&#x666E;&#x901A;&#x51FD;&#x6570;&#x533A;&#x522B;&#xFF0C;&#x6784;&#x9020;&#x51FD;&#x6570;&#x540D;&#x5B57;&#x7684;&#x7B2C;&#x4E00;&#x4E2A;&#x5B57;&#x6BCD;&#x901A;&#x5E38;&#x5927;&#x5199;&#x3002;</p>
<p>&#x6784;&#x9020;&#x51FD;&#x6570;&#x7684;&#x7279;&#x70B9;&#x6709;&#x4E24;&#x4E2A;&#x3002;</p>
<ul>
<li>&#x51FD;&#x6570;&#x4F53;&#x5185;&#x90E8;&#x4F7F;&#x7528;&#x4E86;<code>this</code>&#x5173;&#x952E;&#x5B57;&#xFF0C;&#x4EE3;&#x8868;&#x4E86;&#x6240;&#x8981;&#x751F;&#x6210;&#x7684;&#x5BF9;&#x8C61;&#x5B9E;&#x4F8B;&#x3002;</li>
<li>&#x751F;&#x6210;&#x5BF9;&#x8C61;&#x7684;&#x65F6;&#x5019;&#xFF0C;&#x5FC5;&#x987B;&#x4F7F;&#x7528;<code>new</code>&#x547D;&#x4EE4;&#x3002;</li>
</ul>
<p>&#x4E0B;&#x9762;&#x5148;&#x4ECB;&#x7ECD;<code>new</code>&#x547D;&#x4EE4;&#x3002;</p>
<h2 id="new-&#x547D;&#x4EE4;">new &#x547D;&#x4EE4;</h2>
<h3 id="&#x57FA;&#x672C;&#x7528;&#x6CD5;">&#x57FA;&#x672C;&#x7528;&#x6CD5;</h3>
<p><code>new</code>&#x547D;&#x4EE4;&#x7684;&#x4F5C;&#x7528;&#xFF0C;&#x5C31;&#x662F;&#x6267;&#x884C;&#x6784;&#x9020;&#x51FD;&#x6570;&#xFF0C;&#x8FD4;&#x56DE;&#x4E00;&#x4E2A;&#x5B9E;&#x4F8B;&#x5BF9;&#x8C61;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> Vehicle = <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) </span>{
  <span class="hljs-keyword">this</span>.price = <span class="hljs-number">1000</span>;
};

<span class="hljs-keyword">var</span> v = <span class="hljs-keyword">new</span> Vehicle();
v.price <span class="hljs-comment">// 1000</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x901A;&#x8FC7;<code>new</code>&#x547D;&#x4EE4;&#xFF0C;&#x8BA9;&#x6784;&#x9020;&#x51FD;&#x6570;<code>Vehicle</code>&#x751F;&#x6210;&#x4E00;&#x4E2A;&#x5B9E;&#x4F8B;&#x5BF9;&#x8C61;&#xFF0C;&#x4FDD;&#x5B58;&#x5728;&#x53D8;&#x91CF;<code>v</code>&#x4E2D;&#x3002;&#x8FD9;&#x4E2A;&#x65B0;&#x751F;&#x6210;&#x7684;&#x5B9E;&#x4F8B;&#x5BF9;&#x8C61;&#xFF0C;&#x4ECE;&#x6784;&#x9020;&#x51FD;&#x6570;<code>Vehicle</code>&#x5F97;&#x5230;&#x4E86;<code>price</code>&#x5C5E;&#x6027;&#x3002;<code>new</code>&#x547D;&#x4EE4;&#x6267;&#x884C;&#x65F6;&#xFF0C;&#x6784;&#x9020;&#x51FD;&#x6570;&#x5185;&#x90E8;&#x7684;<code>this</code>&#xFF0C;&#x5C31;&#x4EE3;&#x8868;&#x4E86;&#x65B0;&#x751F;&#x6210;&#x7684;&#x5B9E;&#x4F8B;&#x5BF9;&#x8C61;&#xFF0C;<code>this.price</code>&#x8868;&#x793A;&#x5B9E;&#x4F8B;&#x5BF9;&#x8C61;&#x6709;&#x4E00;&#x4E2A;<code>price</code>&#x5C5E;&#x6027;&#xFF0C;&#x503C;&#x662F;1000&#x3002;</p>
<p>&#x4F7F;&#x7528;<code>new</code>&#x547D;&#x4EE4;&#x65F6;&#xFF0C;&#x6839;&#x636E;&#x9700;&#x8981;&#xFF0C;&#x6784;&#x9020;&#x51FD;&#x6570;&#x4E5F;&#x53EF;&#x4EE5;&#x63A5;&#x53D7;&#x53C2;&#x6570;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> Vehicle = <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params">p</span>) </span>{
  <span class="hljs-keyword">this</span>.price = p;
};

<span class="hljs-keyword">var</span> v = <span class="hljs-keyword">new</span> Vehicle(<span class="hljs-number">500</span>);
</code></pre>
<p><code>new</code>&#x547D;&#x4EE4;&#x672C;&#x8EAB;&#x5C31;&#x53EF;&#x4EE5;&#x6267;&#x884C;&#x6784;&#x9020;&#x51FD;&#x6570;&#xFF0C;&#x6240;&#x4EE5;&#x540E;&#x9762;&#x7684;&#x6784;&#x9020;&#x51FD;&#x6570;&#x53EF;&#x4EE5;&#x5E26;&#x62EC;&#x53F7;&#xFF0C;&#x4E5F;&#x53EF;&#x4EE5;&#x4E0D;&#x5E26;&#x62EC;&#x53F7;&#x3002;&#x4E0B;&#x9762;&#x4E24;&#x884C;&#x4EE3;&#x7801;&#x662F;&#x7B49;&#x4EF7;&#x7684;&#xFF0C;&#x4F46;&#x662F;&#x4E3A;&#x4E86;&#x8868;&#x793A;&#x8FD9;&#x91CC;&#x662F;&#x51FD;&#x6570;&#x8C03;&#x7528;&#xFF0C;&#x63A8;&#x8350;&#x4F7F;&#x7528;&#x62EC;&#x53F7;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-comment">// &#x63A8;&#x8350;&#x7684;&#x5199;&#x6CD5;</span>
<span class="hljs-keyword">var</span> v = <span class="hljs-keyword">new</span> Vehicle();
<span class="hljs-comment">// &#x4E0D;&#x63A8;&#x8350;&#x7684;&#x5199;&#x6CD5;</span>
<span class="hljs-keyword">var</span> v = <span class="hljs-keyword">new</span> Vehicle;
</code></pre>
<p>&#x4E00;&#x4E2A;&#x5F88;&#x81EA;&#x7136;&#x7684;&#x95EE;&#x9898;&#x662F;&#xFF0C;&#x5982;&#x679C;&#x5FD8;&#x4E86;&#x4F7F;&#x7528;<code>new</code>&#x547D;&#x4EE4;&#xFF0C;&#x76F4;&#x63A5;&#x8C03;&#x7528;&#x6784;&#x9020;&#x51FD;&#x6570;&#x4F1A;&#x53D1;&#x751F;&#x4EC0;&#x4E48;&#x4E8B;&#xFF1F;</p>
<p>&#x8FD9;&#x79CD;&#x60C5;&#x51B5;&#x4E0B;&#xFF0C;&#x6784;&#x9020;&#x51FD;&#x6570;&#x5C31;&#x53D8;&#x6210;&#x4E86;&#x666E;&#x901A;&#x51FD;&#x6570;&#xFF0C;&#x5E76;&#x4E0D;&#x4F1A;&#x751F;&#x6210;&#x5B9E;&#x4F8B;&#x5BF9;&#x8C61;&#x3002;&#x800C;&#x4E14;&#x7531;&#x4E8E;&#x540E;&#x9762;&#x4F1A;&#x8BF4;&#x5230;&#x7684;&#x539F;&#x56E0;&#xFF0C;<code>this</code>&#x8FD9;&#x65F6;&#x4EE3;&#x8868;&#x5168;&#x5C40;&#x5BF9;&#x8C61;&#xFF0C;&#x5C06;&#x9020;&#x6210;&#x4E00;&#x4E9B;&#x610F;&#x60F3;&#x4E0D;&#x5230;&#x7684;&#x7ED3;&#x679C;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> Vehicle = <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params"></span>)</span>{
  <span class="hljs-keyword">this</span>.price = <span class="hljs-number">1000</span>;
};

<span class="hljs-keyword">var</span> v = Vehicle();
v <span class="hljs-comment">// undefined</span>
price <span class="hljs-comment">// 1000</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;&#x8C03;&#x7528;<code>Vehicle</code>&#x6784;&#x9020;&#x51FD;&#x6570;&#x65F6;&#xFF0C;&#x5FD8;&#x4E86;&#x52A0;&#x4E0A;<code>new</code>&#x547D;&#x4EE4;&#x3002;&#x7ED3;&#x679C;&#xFF0C;&#x53D8;&#x91CF;<code>v</code>&#x53D8;&#x6210;&#x4E86;<code>undefined</code>&#xFF0C;&#x800C;<code>price</code>&#x5C5E;&#x6027;&#x53D8;&#x6210;&#x4E86;&#x5168;&#x5C40;&#x53D8;&#x91CF;&#x3002;&#x56E0;&#x6B64;&#xFF0C;&#x5E94;&#x8BE5;&#x975E;&#x5E38;&#x5C0F;&#x5FC3;&#xFF0C;&#x907F;&#x514D;&#x4E0D;&#x4F7F;&#x7528;<code>new</code>&#x547D;&#x4EE4;&#x3001;&#x76F4;&#x63A5;&#x8C03;&#x7528;&#x6784;&#x9020;&#x51FD;&#x6570;&#x3002;</p>
<p>&#x4E3A;&#x4E86;&#x4FDD;&#x8BC1;&#x6784;&#x9020;&#x51FD;&#x6570;&#x5FC5;&#x987B;&#x4E0E;<code>new</code>&#x547D;&#x4EE4;&#x4E00;&#x8D77;&#x4F7F;&#x7528;&#xFF0C;&#x4E00;&#x4E2A;&#x89E3;&#x51B3;&#x529E;&#x6CD5;&#x662F;&#xFF0C;&#x6784;&#x9020;&#x51FD;&#x6570;&#x5185;&#x90E8;&#x4F7F;&#x7528;&#x4E25;&#x683C;&#x6A21;&#x5F0F;&#xFF0C;&#x5373;&#x7B2C;&#x4E00;&#x884C;&#x52A0;&#x4E0A;<code>use strict</code>&#x3002;&#x8FD9;&#x6837;&#x7684;&#x8BDD;&#xFF0C;&#x4E00;&#x65E6;&#x5FD8;&#x4E86;&#x4F7F;&#x7528;<code>new</code>&#x547D;&#x4EE4;&#xFF0C;&#x76F4;&#x63A5;&#x8C03;&#x7528;&#x6784;&#x9020;&#x51FD;&#x6570;&#x5C31;&#x4F1A;&#x62A5;&#x9519;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">Fubar</span>(<span class="hljs-params">foo, bar</span>)</span>{
<span class="hljs-meta">  &apos;use strict&apos;</span>;
  <span class="hljs-keyword">this</span>._foo = foo;
  <span class="hljs-keyword">this</span>._bar = bar;
}

Fubar()
<span class="hljs-comment">// TypeError: Cannot set property &apos;_foo&apos; of undefined</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x7684;<code>Fubar</code>&#x4E3A;&#x6784;&#x9020;&#x51FD;&#x6570;&#xFF0C;<code>use strict</code>&#x547D;&#x4EE4;&#x4FDD;&#x8BC1;&#x4E86;&#x8BE5;&#x51FD;&#x6570;&#x5728;&#x4E25;&#x683C;&#x6A21;&#x5F0F;&#x4E0B;&#x8FD0;&#x884C;&#x3002;&#x7531;&#x4E8E;&#x4E25;&#x683C;&#x6A21;&#x5F0F;&#x4E2D;&#xFF0C;&#x51FD;&#x6570;&#x5185;&#x90E8;&#x7684;<code>this</code>&#x4E0D;&#x80FD;&#x6307;&#x5411;&#x5168;&#x5C40;&#x5BF9;&#x8C61;&#xFF0C;&#x9ED8;&#x8BA4;&#x7B49;&#x4E8E;<code>undefined</code>&#xFF0C;&#x5BFC;&#x81F4;&#x4E0D;&#x52A0;<code>new</code>&#x8C03;&#x7528;&#x4F1A;&#x62A5;&#x9519;&#xFF08;JavaScript &#x4E0D;&#x5141;&#x8BB8;&#x5BF9;<code>undefined</code>&#x6DFB;&#x52A0;&#x5C5E;&#x6027;&#xFF09;&#x3002;</p>
<p>&#x53E6;&#x4E00;&#x4E2A;&#x89E3;&#x51B3;&#x529E;&#x6CD5;&#xFF0C;&#x6784;&#x9020;&#x51FD;&#x6570;&#x5185;&#x90E8;&#x5224;&#x65AD;&#x662F;&#x5426;&#x4F7F;&#x7528;<code>new</code>&#x547D;&#x4EE4;&#xFF0C;&#x5982;&#x679C;&#x53D1;&#x73B0;&#x6CA1;&#x6709;&#x4F7F;&#x7528;&#xFF0C;&#x5219;&#x76F4;&#x63A5;&#x8FD4;&#x56DE;&#x4E00;&#x4E2A;&#x5B9E;&#x4F8B;&#x5BF9;&#x8C61;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">Fubar</span>(<span class="hljs-params">foo, bar</span>) </span>{
  <span class="hljs-keyword">if</span> (!(<span class="hljs-keyword">this</span> <span class="hljs-keyword">instanceof</span> Fubar)) {
    <span class="hljs-keyword">return</span> <span class="hljs-keyword">new</span> Fubar(foo, bar);
  }

  <span class="hljs-keyword">this</span>._foo = foo;
  <span class="hljs-keyword">this</span>._bar = bar;
}

Fubar(<span class="hljs-number">1</span>, <span class="hljs-number">2</span>)._foo <span class="hljs-comment">// 1</span>
(<span class="hljs-keyword">new</span> Fubar(<span class="hljs-number">1</span>, <span class="hljs-number">2</span>))._foo <span class="hljs-comment">// 1</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#x7684;&#x6784;&#x9020;&#x51FD;&#x6570;&#xFF0C;&#x4E0D;&#x7BA1;&#x52A0;&#x4E0D;&#x52A0;<code>new</code>&#x547D;&#x4EE4;&#xFF0C;&#x90FD;&#x4F1A;&#x5F97;&#x5230;&#x540C;&#x6837;&#x7684;&#x7ED3;&#x679C;&#x3002;</p>
<h3 id="new-&#x547D;&#x4EE4;&#x7684;&#x539F;&#x7406;">new &#x547D;&#x4EE4;&#x7684;&#x539F;&#x7406;</h3>
<p>&#x4F7F;&#x7528;<code>new</code>&#x547D;&#x4EE4;&#x65F6;&#xFF0C;&#x5B83;&#x540E;&#x9762;&#x7684;&#x51FD;&#x6570;&#x4F9D;&#x6B21;&#x6267;&#x884C;&#x4E0B;&#x9762;&#x7684;&#x6B65;&#x9AA4;&#x3002;</p>
<ol>
<li>&#x521B;&#x5EFA;&#x4E00;&#x4E2A;&#x7A7A;&#x5BF9;&#x8C61;&#xFF0C;&#x4F5C;&#x4E3A;&#x5C06;&#x8981;&#x8FD4;&#x56DE;&#x7684;&#x5BF9;&#x8C61;&#x5B9E;&#x4F8B;&#x3002;</li>
<li>&#x5C06;&#x8FD9;&#x4E2A;&#x7A7A;&#x5BF9;&#x8C61;&#x7684;&#x539F;&#x578B;&#xFF0C;&#x6307;&#x5411;&#x6784;&#x9020;&#x51FD;&#x6570;&#x7684;<code>prototype</code>&#x5C5E;&#x6027;&#x3002;</li>
<li>&#x5C06;&#x8FD9;&#x4E2A;&#x7A7A;&#x5BF9;&#x8C61;&#x8D4B;&#x503C;&#x7ED9;&#x51FD;&#x6570;&#x5185;&#x90E8;&#x7684;<code>this</code>&#x5173;&#x952E;&#x5B57;&#x3002;</li>
<li>&#x5F00;&#x59CB;&#x6267;&#x884C;&#x6784;&#x9020;&#x51FD;&#x6570;&#x5185;&#x90E8;&#x7684;&#x4EE3;&#x7801;&#x3002;</li>
</ol>
<p>&#x4E5F;&#x5C31;&#x662F;&#x8BF4;&#xFF0C;&#x6784;&#x9020;&#x51FD;&#x6570;&#x5185;&#x90E8;&#xFF0C;<code>this</code>&#x6307;&#x7684;&#x662F;&#x4E00;&#x4E2A;&#x65B0;&#x751F;&#x6210;&#x7684;&#x7A7A;&#x5BF9;&#x8C61;&#xFF0C;&#x6240;&#x6709;&#x9488;&#x5BF9;<code>this</code>&#x7684;&#x64CD;&#x4F5C;&#xFF0C;&#x90FD;&#x4F1A;&#x53D1;&#x751F;&#x5728;&#x8FD9;&#x4E2A;&#x7A7A;&#x5BF9;&#x8C61;&#x4E0A;&#x3002;&#x6784;&#x9020;&#x51FD;&#x6570;&#x4E4B;&#x6240;&#x4EE5;&#x53EB;&#x201C;&#x6784;&#x9020;&#x51FD;&#x6570;&#x201D;&#xFF0C;&#x5C31;&#x662F;&#x8BF4;&#x8FD9;&#x4E2A;&#x51FD;&#x6570;&#x7684;&#x76EE;&#x7684;&#xFF0C;&#x5C31;&#x662F;&#x64CD;&#x4F5C;&#x4E00;&#x4E2A;&#x7A7A;&#x5BF9;&#x8C61;&#xFF08;&#x5373;<code>this</code>&#x5BF9;&#x8C61;&#xFF09;&#xFF0C;&#x5C06;&#x5176;&#x201C;&#x6784;&#x9020;&#x201D;&#x4E3A;&#x9700;&#x8981;&#x7684;&#x6837;&#x5B50;&#x3002;</p>
<p>&#x5982;&#x679C;&#x6784;&#x9020;&#x51FD;&#x6570;&#x5185;&#x90E8;&#x6709;<code>return</code>&#x8BED;&#x53E5;&#xFF0C;&#x800C;&#x4E14;<code>return</code>&#x540E;&#x9762;&#x8DDF;&#x7740;&#x4E00;&#x4E2A;&#x5BF9;&#x8C61;&#xFF0C;<code>new</code>&#x547D;&#x4EE4;&#x4F1A;&#x8FD4;&#x56DE;<code>return</code>&#x8BED;&#x53E5;&#x6307;&#x5B9A;&#x7684;&#x5BF9;&#x8C61;&#xFF1B;&#x5426;&#x5219;&#xFF0C;&#x5C31;&#x4F1A;&#x4E0D;&#x7BA1;<code>return</code>&#x8BED;&#x53E5;&#xFF0C;&#x8FD4;&#x56DE;<code>this</code>&#x5BF9;&#x8C61;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> Vehicle = <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) </span>{
  <span class="hljs-keyword">this</span>.price = <span class="hljs-number">1000</span>;
  <span class="hljs-keyword">return</span> <span class="hljs-number">1000</span>;
};

(<span class="hljs-keyword">new</span> Vehicle()) === <span class="hljs-number">1000</span>
<span class="hljs-comment">// false</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;&#x6784;&#x9020;&#x51FD;&#x6570;<code>Vehicle</code>&#x7684;<code>return</code>&#x8BED;&#x53E5;&#x8FD4;&#x56DE;&#x4E00;&#x4E2A;&#x6570;&#x503C;&#x3002;&#x8FD9;&#x65F6;&#xFF0C;<code>new</code>&#x547D;&#x4EE4;&#x5C31;&#x4F1A;&#x5FFD;&#x7565;&#x8FD9;&#x4E2A;<code>return</code>&#x8BED;&#x53E5;&#xFF0C;&#x8FD4;&#x56DE;&#x201C;&#x6784;&#x9020;&#x201D;&#x540E;&#x7684;<code>this</code>&#x5BF9;&#x8C61;&#x3002;</p>
<p>&#x4F46;&#x662F;&#xFF0C;&#x5982;&#x679C;<code>return</code>&#x8BED;&#x53E5;&#x8FD4;&#x56DE;&#x7684;&#x662F;&#x4E00;&#x4E2A;&#x8DDF;<code>this</code>&#x65E0;&#x5173;&#x7684;&#x65B0;&#x5BF9;&#x8C61;&#xFF0C;<code>new</code>&#x547D;&#x4EE4;&#x4F1A;&#x8FD4;&#x56DE;&#x8FD9;&#x4E2A;&#x65B0;&#x5BF9;&#x8C61;&#xFF0C;&#x800C;&#x4E0D;&#x662F;<code>this</code>&#x5BF9;&#x8C61;&#x3002;&#x8FD9;&#x4E00;&#x70B9;&#x9700;&#x8981;&#x7279;&#x522B;&#x5F15;&#x8D77;&#x6CE8;&#x610F;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> Vehicle = <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params"></span>)</span>{
  <span class="hljs-keyword">this</span>.price = <span class="hljs-number">1000</span>;
  <span class="hljs-keyword">return</span> { price: <span class="hljs-number">2000</span> };
};

(<span class="hljs-keyword">new</span> Vehicle()).price
<span class="hljs-comment">// 2000</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;&#x6784;&#x9020;&#x51FD;&#x6570;<code>Vehicle</code>&#x7684;<code>return</code>&#x8BED;&#x53E5;&#xFF0C;&#x8FD4;&#x56DE;&#x7684;&#x662F;&#x4E00;&#x4E2A;&#x65B0;&#x5BF9;&#x8C61;&#x3002;<code>new</code>&#x547D;&#x4EE4;&#x4F1A;&#x8FD4;&#x56DE;&#x8FD9;&#x4E2A;&#x5BF9;&#x8C61;&#xFF0C;&#x800C;&#x4E0D;&#x662F;<code>this</code>&#x5BF9;&#x8C61;&#x3002;</p>
<p>&#x53E6;&#x4E00;&#x65B9;&#x9762;&#xFF0C;&#x5982;&#x679C;&#x5BF9;&#x666E;&#x901A;&#x51FD;&#x6570;&#xFF08;&#x5185;&#x90E8;&#x6CA1;&#x6709;<code>this</code>&#x5173;&#x952E;&#x5B57;&#x7684;&#x51FD;&#x6570;&#xFF09;&#x4F7F;&#x7528;<code>new</code>&#x547D;&#x4EE4;&#xFF0C;&#x5219;&#x4F1A;&#x8FD4;&#x56DE;&#x4E00;&#x4E2A;&#x7A7A;&#x5BF9;&#x8C61;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">getMessage</span>(<span class="hljs-params"></span>) </span>{
  <span class="hljs-keyword">return</span> <span class="hljs-string">&apos;this is a message&apos;</span>;
}

<span class="hljs-keyword">var</span> msg = <span class="hljs-keyword">new</span> getMessage();

msg <span class="hljs-comment">// {}</span>
<span class="hljs-keyword">typeof</span> msg <span class="hljs-comment">// &quot;object&quot;</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;<code>getMessage</code>&#x662F;&#x4E00;&#x4E2A;&#x666E;&#x901A;&#x51FD;&#x6570;&#xFF0C;&#x8FD4;&#x56DE;&#x4E00;&#x4E2A;&#x5B57;&#x7B26;&#x4E32;&#x3002;&#x5BF9;&#x5B83;&#x4F7F;&#x7528;<code>new</code>&#x547D;&#x4EE4;&#xFF0C;&#x4F1A;&#x5F97;&#x5230;&#x4E00;&#x4E2A;&#x7A7A;&#x5BF9;&#x8C61;&#x3002;&#x8FD9;&#x662F;&#x56E0;&#x4E3A;<code>new</code>&#x547D;&#x4EE4;&#x603B;&#x662F;&#x8FD4;&#x56DE;&#x4E00;&#x4E2A;&#x5BF9;&#x8C61;&#xFF0C;&#x8981;&#x4E48;&#x662F;&#x5B9E;&#x4F8B;&#x5BF9;&#x8C61;&#xFF0C;&#x8981;&#x4E48;&#x662F;<code>return</code>&#x8BED;&#x53E5;&#x6307;&#x5B9A;&#x7684;&#x5BF9;&#x8C61;&#x3002;&#x672C;&#x4F8B;&#x4E2D;&#xFF0C;<code>return</code>&#x8BED;&#x53E5;&#x8FD4;&#x56DE;&#x7684;&#x662F;&#x5B57;&#x7B26;&#x4E32;&#xFF0C;&#x6240;&#x4EE5;<code>new</code>&#x547D;&#x4EE4;&#x5C31;&#x5FFD;&#x7565;&#x4E86;&#x8BE5;&#x8BED;&#x53E5;&#x3002;</p>
<p><code>new</code>&#x547D;&#x4EE4;&#x7B80;&#x5316;&#x7684;&#x5185;&#x90E8;&#x6D41;&#x7A0B;&#xFF0C;&#x53EF;&#x4EE5;&#x7528;&#x4E0B;&#x9762;&#x7684;&#x4EE3;&#x7801;&#x8868;&#x793A;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">_new</span>(<span class="hljs-params"><span class="hljs-comment">/* &#x6784;&#x9020;&#x51FD;&#x6570; */</span> constructor, <span class="hljs-comment">/* &#x6784;&#x9020;&#x51FD;&#x6570;&#x53C2;&#x6570; */</span> params</span>) </span>{
  <span class="hljs-comment">// &#x5C06; arguments &#x5BF9;&#x8C61;&#x8F6C;&#x4E3A;&#x6570;&#x7EC4;</span>
  <span class="hljs-keyword">var</span> args = [].slice.call(<span class="hljs-built_in">arguments</span>);
  <span class="hljs-comment">// &#x53D6;&#x51FA;&#x6784;&#x9020;&#x51FD;&#x6570;</span>
  <span class="hljs-keyword">var</span> <span class="hljs-keyword">constructor</span> = args.shift();
  // &#x521B;&#x5EFA;&#x4E00;&#x4E2A;&#x7A7A;&#x5BF9;&#x8C61;&#xFF0C;&#x7EE7;&#x627F;&#x6784;&#x9020;&#x51FD;&#x6570;&#x7684; prototype &#x5C5E;&#x6027;
  var context = Object.create(<span class="hljs-keyword">constructor</span>.prototype);
  // &#x6267;&#x884C;&#x6784;&#x9020;&#x51FD;&#x6570;
  var result = <span class="hljs-keyword">constructor</span>.apply(context, args);
  // &#x5982;&#x679C;&#x8FD4;&#x56DE;&#x7ED3;&#x679C;&#x662F;&#x5BF9;&#x8C61;&#xFF0C;&#x5C31;&#x76F4;&#x63A5;&#x8FD4;&#x56DE;&#xFF0C;&#x5426;&#x5219;&#x8FD4;&#x56DE; context &#x5BF9;&#x8C61;
  return (typeof result === &apos;object&apos; &amp;&amp; result != null) ? result : context;
}

// &#x5B9E;&#x4F8B;
var actor = _new(Person, &apos;&#x5F20;&#x4E09;&apos;, 28);
</code></pre>
<h3 id="newtarget">new.target</h3>
<p>&#x51FD;&#x6570;&#x5185;&#x90E8;&#x53EF;&#x4EE5;&#x4F7F;&#x7528;<code>new.target</code>&#x5C5E;&#x6027;&#x3002;&#x5982;&#x679C;&#x5F53;&#x524D;&#x51FD;&#x6570;&#x662F;<code>new</code>&#x547D;&#x4EE4;&#x8C03;&#x7528;&#xFF0C;<code>new.target</code>&#x6307;&#x5411;&#x5F53;&#x524D;&#x51FD;&#x6570;&#xFF0C;&#x5426;&#x5219;&#x4E3A;<code>undefined</code>&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">f</span>(<span class="hljs-params"></span>) </span>{
  <span class="hljs-built_in">console</span>.log(<span class="hljs-keyword">new</span>.target === f);
}

f() <span class="hljs-comment">// false</span>
<span class="hljs-keyword">new</span> f() <span class="hljs-comment">// true</span>
</code></pre>
<p>&#x4F7F;&#x7528;&#x8FD9;&#x4E2A;&#x5C5E;&#x6027;&#xFF0C;&#x53EF;&#x4EE5;&#x5224;&#x65AD;&#x51FD;&#x6570;&#x8C03;&#x7528;&#x7684;&#x65F6;&#x5019;&#xFF0C;&#x662F;&#x5426;&#x4F7F;&#x7528;<code>new</code>&#x547D;&#x4EE4;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">f</span>(<span class="hljs-params"></span>) </span>{
  <span class="hljs-keyword">if</span> (!<span class="hljs-keyword">new</span>.target) {
    <span class="hljs-keyword">throw</span> <span class="hljs-keyword">new</span> <span class="hljs-built_in">Error</span>(<span class="hljs-string">&apos;&#x8BF7;&#x4F7F;&#x7528; new &#x547D;&#x4EE4;&#x8C03;&#x7528;&#xFF01;&apos;</span>);
  }
  <span class="hljs-comment">// ...</span>
}

f() <span class="hljs-comment">// Uncaught Error: &#x8BF7;&#x4F7F;&#x7528; new &#x547D;&#x4EE4;&#x8C03;&#x7528;&#xFF01;</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;&#x6784;&#x9020;&#x51FD;&#x6570;<code>f</code>&#x8C03;&#x7528;&#x65F6;&#xFF0C;&#x6CA1;&#x6709;&#x4F7F;&#x7528;<code>new</code>&#x547D;&#x4EE4;&#xFF0C;&#x5C31;&#x629B;&#x51FA;&#x4E00;&#x4E2A;&#x9519;&#x8BEF;&#x3002;</p>
<h2 id="objectcreate-&#x521B;&#x5EFA;&#x5B9E;&#x4F8B;&#x5BF9;&#x8C61;">Object.create() &#x521B;&#x5EFA;&#x5B9E;&#x4F8B;&#x5BF9;&#x8C61;</h2>
<p>&#x6784;&#x9020;&#x51FD;&#x6570;&#x4F5C;&#x4E3A;&#x6A21;&#x677F;&#xFF0C;&#x53EF;&#x4EE5;&#x751F;&#x6210;&#x5B9E;&#x4F8B;&#x5BF9;&#x8C61;&#x3002;&#x4F46;&#x662F;&#xFF0C;&#x6709;&#x65F6;&#x62FF;&#x4E0D;&#x5230;&#x6784;&#x9020;&#x51FD;&#x6570;&#xFF0C;&#x53EA;&#x80FD;&#x62FF;&#x5230;&#x4E00;&#x4E2A;&#x73B0;&#x6709;&#x7684;&#x5BF9;&#x8C61;&#x3002;&#x6211;&#x4EEC;&#x5E0C;&#x671B;&#x4EE5;&#x8FD9;&#x4E2A;&#x73B0;&#x6709;&#x7684;&#x5BF9;&#x8C61;&#x4F5C;&#x4E3A;&#x6A21;&#x677F;&#xFF0C;&#x751F;&#x6210;&#x65B0;&#x7684;&#x5B9E;&#x4F8B;&#x5BF9;&#x8C61;&#xFF0C;&#x8FD9;&#x65F6;&#x5C31;&#x53EF;&#x4EE5;&#x4F7F;&#x7528;<code>Object.create()</code>&#x65B9;&#x6CD5;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> person1 = {
  name: <span class="hljs-string">&apos;&#x5F20;&#x4E09;&apos;</span>,
  age: <span class="hljs-number">38</span>,
  greeting: <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params"></span>) </span>{
    <span class="hljs-built_in">console</span>.log(<span class="hljs-string">&apos;Hi! I\&apos;m &apos;</span> + <span class="hljs-keyword">this</span>.name + <span class="hljs-string">&apos;.&apos;</span>);
  }
};

<span class="hljs-keyword">var</span> person2 = <span class="hljs-built_in">Object</span>.create(person1);

person2.name <span class="hljs-comment">// &#x5F20;&#x4E09;</span>
person2.greeting() <span class="hljs-comment">// Hi! I&apos;m &#x5F20;&#x4E09;.</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;&#x5BF9;&#x8C61;<code>person1</code>&#x662F;<code>person2</code>&#x7684;&#x6A21;&#x677F;&#xFF0C;&#x540E;&#x8005;&#x7EE7;&#x627F;&#x4E86;&#x524D;&#x8005;&#x7684;&#x5C5E;&#x6027;&#x548C;&#x65B9;&#x6CD5;&#x3002;</p>
<p><code>Object.create()</code>&#x7684;&#x8BE6;&#x7EC6;&#x4ECB;&#x7ECD;&#xFF0C;&#x8BF7;&#x770B;&#x540E;&#x9762;&#x7684;&#x76F8;&#x5173;&#x7AE0;&#x8282;&#x3002;</p>




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